Screw-driver



(No Model.)

v J. H. LYON.

soRRw- DRIVER.

No. 464,574. Patented Dec. 8, 1891.v

- UNiTnn STATES PATENT OFFICE. u

JAMES IIOVARD LYON, OF NEIV LONDON, C@NYEC'IICU'I.

SCREWjDRlVER.-

SPECIFICATION forming part of Letters Patent No. 464,574, dated December 8, 1891.

" Application filed November 13, 1890. Serial No. 371,383. (No model.)

To @ZZ whom it may concern:

Be it known that I, JAMES HOWARD LYON,

A a citizen of the United States, residing in the city and county of New London, and State of Connecticut, have made certain new and useful Improvements in Screw-Drivers, of which the following'is a specification, reference being had to the accompanying sheet of drawings, in which- Figure lis a side View of a screw-driver embodying said improvement, the connectingnut g being shown in longitudinal section.

Y Fig. 2 is a longitudinal sectional View of said screw-driver with its several parts in the same positions as in Fig. l-that is to say, in the povs'itions assumed when about to be used as an ordinaryT driver-#and Fig. 3 shows the same as arranged for use as a spiral driver. Fig. at is a longitudinal Vsectional view of the chuckjaws l) and the collar or ferrule of which they are parts, and shows, also, the end of the spiral sect-ion d.

My invention relates, particularly, to the class of screw-drivers in which a spiral or screw of considerable pitch isv employed to rotate the head or chuck that carries the driver proper in manner substantially as explained in PatentNo. 268,938, issued December 12, 1882, to Alban H. Reid.

In using drivers of this class it frequently becomes necessary to operate them with one hand onlyas, for example, in places where there is little rooxn-and at such times the Weight of the driver proper and ofthe chuck that supports it serves to withdraw said driver and the attached spiral from the handle,and when extended renders it extremely awkward to operate the driver. Such a result is quite likely to occur when not anticipated,and frequently by this sudden extension ofthe driver injury is done' to furniture or other objects with which the Itool is thus suddenly brought in contact.

My invention seeks to provide a coupling or union by means of which the extensible driver-section may be ,firmly connected with the handle-section and the whole 1nade .to serve as an ordinary screwdriver.

Referring to the drawings, the letter t indicates the screw-driver proper, b b a chuck for holding the same, and c the handle-section, the latter being bored throughout its length,

or nearly so, to receive a spirally-ribbed section d, which is connected with the chuck, as described below, and is adapted to move longitudinally within the recessed'handle. A pin or lug d', secured to the handle or to one of its rigid parts, projects into the groove kbetween the spiral ribs of section d, and it will be obvious that if the handle be held firmly and the spiral section moved lengthwisetherein the latter will be caused to rotate. Attachedrtoithe Youter end vof the spiral section is aferrule c, having projecting exteriorlythreaded jaws h, which with a milled nut b provide a chuckto hold the screw-driver blade a. That portion ot' thespiral section d within the ferrule c is turned down in part, as at d2,

and into the annular groove thus provided project one or' more screws c2, the groove being of such length that the spiral section may have considerable lengthwise movement in the ferrule. section is formed with a projecting transverse rib d3, which when forced forward in the ferrule may enter a corresponding recess c3 at the base of the chuck-jaws b, and thus serve as a clutch to cause said spiral section and the chuck to rotate together. v"When the driver is in use, pressure on the handle will at once force rib d3 into its recess csand cause the driver-blade ct to rotate; but when the handle is withdrawn the annular groove d2 allows the The Vextreme end of the spiral said rib to leave the recess, as inv Fig. 4, and

the chuck and the driver-blade remain at rest, while the handle is drawn off from the spiral.

Then the handle is again forced forward, the.

described clutch is again brought into servlar ferrulef, provided with recesses or notches into which the said lugs may enter when the fel-rules are brought together. '(See Fig. l.) The periphery of ferrule f and of such portions of c as enter said ferrule are screwthreaded, as shown. A nut g, with milled IOO periphery, is located on the ferrule f and adapted to be screwed lengthwise thereon. XVhen it is desired to use the screw-driver in connection with the described spiral section, the nut g is screwed toward the handle c until itleaves the lugs c', as in Fig. 3, when the spiral may be readily drawn from the handle. \Vhen, however, it is desired to use it as an ordinary screw-driver, the spiral is forced into the handle as far as it will go, the lugs e being made to enter the described notches in` ferrule f, and the nut gis then screwed along said ferrule until it reaches and covers the threaded lugs e', when the two ferrules e and f are securely clamped together and the handle and driver-blade become practically as rigidly connected asif the latter was driven into the former. Instead of the slight lugs e 

